Apparatus for erasing



May 4 1937. H. LUKOWSKI APPARATUS FOR ERASING Filed March 25, 1955 INVENTOR.

Patented May 4, 1937 UNITED STATES PATENT OFFICE Automatic Eraser Corporation,

Application March 25,

' 2 Claims.

This invention relates to erasers and more particularly to such as are adapted to remove single characters from typewritten matter and other small marks from paper, or like surfaces.

Hand held rubbers are clumsy and cover a greater area than may be required.

Power driven rubber discs are dimcult to guide and are likely to seriously abrade and injure the surface on which the erasure is to be made.

It is therefore an object of this invention to provide an implement having a conical erasing element provided with a conveniently arranged handle by which the erasing cone may be accurately guided. I

A further feature is in the provision of an erasing device so arranged that its operative element is always in full view of the user, its working point never obscured while in operation, thus permitting intelligent application.

Another purpose is to provide a unitary, completely self-contained implement, readily operated by any person, even a novice, in accomplishing the desired results in a rapid, safe and satisfactory manner.

These advantageous objects are attained by the novel construction and combination of few and simple parts hereinafter described and illustrated in the accompanying drawing, constituting a material component of this disclosure, and in which:

Figure l is a side elevational view of an embodiment of the invention.

Figure 2 is a partial longitudinal sectional, partial side view of the same.

Figure 3 is an enlarged sectional view of the eraser, its mounting and dust guard.

Figure 4 is a side elevational view of a modified form of the device.

Referring in greater detail to the drawing, a cylindrical casing, designated by the numeral I, has integrally attached at one end a housing 2, containing a small motor (not shown) of the usual electrical type, energy for which is supplied by a battery 3 disposed within the casing and having the usual terminal 4 engaging the motor.

A spring contact 5 is pressed against the opposite end of the battery 3, the spring being 'enclosed in a cap 6 attached to the casing by screw threads.

The other terminal I of the battery is control- 50 lably engaged to the motor by a switch 8 rotatably mounted on the exterior of the casing I, by which the motor may be energized at the will of the operator. The motor shaft 9 extends axially from the 55 housing 2 and is adapted to irictionally engage New York,

1935, Serial No. 12,194

in a split sleeve in to conduct rotary motion to it, unless excessive resistance is encountered.

Fixed on the opposite, outstanding end oi the sleeve I0 is a conical rubber eraser H, terminating in a small rounded point adapted to obliterate removable marks on the surface to which it is applied neatly and quickly.

A dust guard I2 is fixed on the cylindrical portion of the eraser to rotate with it, preventing the abraded material from affecting the motor shaft bearing and provide a well finished appearance to the device.

The modification shown in Fig. 4 includes merely a different shape of battery casing I3, motor housing I4 and switch.

It will be understood that more than one battery cell may be used in either style of the implement; that the device is of such dimensions and proportions as to be conveniently held in the hand of an operator, that the line of vision to the point of application is not obscured, and that the erasing cones may be replaced when worn.

In operation the implement is held in the handy of an operator perpendicularly or at any preferred inclination to the surface, the point of the eraser gently pressed on the mark to be removed and the point caused to oscillate slightly, rather than held at rest on one spot by placing said point slightly eccentric to the axis of rotation of the power shaft.

Having thus described the invention and set forth the manner of its construction and application, what is claimed as new and sought to be secured by Letters Patent, is:-

1. A power driven eraser device comprising a casing, a power source therein having a shaft extending axially from the casing, a split sleeve frictionally engaged on said power shaft, a rubber eraser having a cylindrical portion mounted on said sleeve, said eraser havinga conical outer end terminating in a rounded point, and a dust guard removably and rotatably carried on the cylindrical portion of said eraser.

2. A power driven eraser device comprising a casing, a power source therein having a shaft extending axially from the casing, a split sleeve frictionally engaged on said power shaft, a tub ber eraser having a cylindrical portion mounted on said sleeve, said eraser having a conical outer end terminating in a rounded point arranged slightly eccentrically to the axis of rotation of the'power shaft, and a dust guard removably and rotatably carried on the cylindrical portion of said eraser.

HERMANN LUKOWSKI. 66 

